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由 Yorick Peterse 提交于
Previously this method would directly receive the output of tag_name(). This method could either return a String or nil. In the previous setup this would somehow magically work but because Rugged::TagCollection#[] doesn't accept nil values it started to fail. To work around this the elsif in change_access_check() assigns the result of tag_name() to a local and then _only_ calls protected_tag?() if the tag name is not nil. The extra parenthesis are put in place to ensure that things are parsed correctly, without these the code would be parsed as follows: elsif tag_ref = (tag_name(ref) && protected_tag(tag_ref)) During runtime this would basically resolve to: elsif tag_ref = (tag_name(ref) && protected_tag(nil)) This is because when you refer to the variable you're assigning _in_ the assignment Ruby returns nil instead of raising an error.
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